Other Income (Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Other Income and Expenses [Abstract]
Income from third party license fees	$ 373	$ 208	$ 712	$ 512
Foreign exchange gains (losses), net	(838)	(2,004)	(2,316)	(1,183)
Gain (loss) on fixed asset disposals, net	(54)	(83)	5,356	(81)
Non-income tax refunds and other related credits	14,295	832	14,392	2,131
Pension and post retirement benefit costs, non-service components	129	(341)	253	(23,866)
Other Operating Income Expense Net	105	395	300	319
Total other income (expense), net	$ 14,010	$ (993)	18,697	(22,168)
Narrative [Abstract]
Pension Settlement Charge				$ 22,700
Certain indirect tax credits			$ 13,300